Mac搭建Ruby on Rails Postgresql解决方案
Maccbook OSX10.8.2注意1 ：HomeBrew 安装 Postgresql注意：Postgresql版本就用9.2的，因为Mac自带的用的是9.2的，否则会冲突。
$ brew search postgresql
注意2：
$ rails new duok -d postgresql
$ cat confing/database.yml
$ gem install pg -- --with-pg-config=/usr/local/bin/pg_config
上面这一句很重要，否则会报错：
PG::ConnectionBad
could not connect to server: No such file or directory (PG::Error)
Is the server running locally and accepting
connections on Unix domain socket "/var/pgsql_socket/.s.PGSQL.5432"?
$ initdb /usr/local/var/postgres
Ubuntu下
http://stackoverflow.com/questions/2942485/psql-fatal-ident-authentication-failed-for-user-postgres
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